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Since the parameter of delivering large amounts of current as in amplification devices is no longer a design concern.
Building power cords for digital equipment and other low current devices, gives the designer a huge amount of creativity to experiment with different materials and configurations.
Changing either the material or configuration can have a dramatic effect on how the equipment performs.
Hence, the goal of power cords that are designed for the types of application you are speaking of, is to provide a steady current power which digital equipment performs best with. Especially when the power has been processed through some type of line conditioner, the last thing you need is a power cord which changes that signal.
Hope that provides a little insight,
Michael Wolff Power Cords